Furnace.



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1,229,706. PatntedJune 12, 1917.

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. UNITED STATES PATENT OFFICE.

DAVID R. BONE, OIE OGLESBY. TEXAS.

Speclflcation of Letters Patent.

Patented June 12, 1917.

Application flledugust 22, 1916. Sbial No. 116,218.

Ta all wfiom it may conem: A V

Be it known that I, DAVID R. BOIRE, a c1t;

zen of the .UnitedStates, residin'g' at Og1esnaces and for pr&heating the air Which is lied to the ,furnaces and for cxclnding all air which has not been preheated. The object is' to feed the fuel to furnaces in such form :that it can a11 be consumed and to furnish enough oxygen to oxidize and combine with all the carbon elements. Another object is tQprovide apparatus by n"hich lignite and cheap coal can be utilized with econ0my and savig of-expense and labor. Other objecte and advantages Will be fully explained in the following description and the invention will be more particulafly pointed out in the c1aims.

Reference is had to the accompanying drawings which form a part of this application.

Figure 1 is a vertical section of the furnace and apparatus for burning the fuel and preheating the air, showing a kiln in con ventional form connected to the furnace. Fig. 2 is an enlargd sectional -view of a stoker, Fig. 3 is a longitudinal section of the revolving feeder.

Similar cha.racters of reference are used' to ihdicate the 'same parts throughout the several views.

The results of the system herein described are obta.ined by admitting only preheated air to. the fire zone where combustion of fuel gases is taking place either in a fu rnce for supplying' heat t0 a kiln on inside a kiln or for a furnace fox supp1ying heat for boilers or for other purposes. In the dramings, a kiln 1' is shown in conventional form provided with a stoker 2 and a fine 3. A 1Eurflace 4 is provided with ate bars 5, a door 6, and stokers. 7. Instea of placing an ash box under the gratte bars 5, as usual, a chute 8 is provided with a flaredupper end or.-mouth 9 to receivethe 'ashes and hot ember's W hich ia1l through the grate bars 5. The nshes all down the inclined chute to .a box 10 from which they can be removed throngh a dodr 11. Provision is made for' a fire .w'ithinthe box 10. Grate bars 12 are provided for receiving the fuel alld.su13port ,4

ing the same for combustion.

heated not only by the fire which is maintained in the box 10, but is also heated by" the embers which fall through the grate bars 5. The box 10 is provided With a door 13, which may be used in supplying fueL to fire on the grat bars 12 and for admission of air which is to be heatcd. The heated air Will risc up through the fuel 14 which The objecb of the fire in box 10 is to heat allthe air. that is fed to the furnace 4. The. air is is being consumed in the frnace 4. The

fuel for fmnace 4 is proferalflyied in pow-- dered form by mcans of stokcrs 7. The fuel ivill fall into the fire zone 15 whre the patticles of fuol.will be oxidized 'and largely converted into gas. The heat and gases will pass directlyinto the kiln 1. A plurality of stokcrs 7 may be proVided and eacb stokv consists of a casing 16 which has o'peni-ngs 17 'into a ho}3per 18 which contains fuel and corrcsponding openings 19 for dnopping the fuel into the fire zone 15 and fumiace 4. The fuel is fe1 by meansof a revoivin ieeder 20. The feeder 20 may be revQlve Iby any suitable means. In Operation cavity 21 formed in the,.feeder will be tmedto un opening 17 in the casing 16 and instantly a. charge of fuel will fill the cavity 21 in the feeder and on Continuons revOlving of the feeder the charge of fuel Will be dumped into the furnace 4 through the dpening 19 in the casing 16, and on each revolution of the feeder 20, eaeh carity 21 W111 gathena charge'of fuel and dump the saine 1nto -furnace 4. In order to prevent ait from entering the furnace 4, short pipes 23 maybe connected with casing opemngs 19 and-project clown into the furnace 4.

A valve or damper 24 is provided for regulating' the flow of heated air thro h the chute 8. A valve or damper 25 is.a so provided for regulating the passage of heflt and burning gases from the fitrnaoe 4 into the kiln 1.

The fire on the grate bars 12 rna y b5.a

principal combustion (akes place. T110 oold air or air in the normal. atmospheric condition is thus excluded and only preheated air is let into the main f.nrnace. The barning of the fuel Will croate the necessary draft Lo force the heat and burning gases into thv kiln 1. The air s 'subjected to a moccss of preheating and after the air is films treated, only such quantity of air as is necessary and no more than isneoded is a1- 10W0d to enter the fnrnace for oxidizng the contents of the combustion clmmber, and as no forced draft s allowed, tho pressure ncessary t0 convey the heat created by the bnrning gasos to the point whore it is to be ntiizod is created'by expans n, additional htatod air boing xupplied as needed to effeob lha combustion of the gases. Nations changes in the sizes and proportions, construction and arrangement of the several parts ma v h made without depmrting from my zinvention. The exclnding of the cold air From the furnaoe is important becauso Hue combustion wll not be i1n1mded or hindcred bybhecold ail. T110 hoat prodnced is thns conserved, as the heatwill not be consmnod in heating (501d air.

\Vhat daim, is,

1. A heab producing apparatus comprising' :n furnace provided with grate bats, means for fcedingfuel to said fnrnace, a conflzined ash and heated air chute depending ffom said furnace, a fire-box at the t'er mination of said chute, and grate bars for .nmintaining a fire in saidfire-box.

A heat producing and heat consering apparatus compris1ng a furnace provided with means for maintaining fuel in Said furnace, a combined ash and heated air chute depending from said furnace, a fire-box at thetermination of and cornmunicating with said chute, a door for said fire-box, and provision therin for maintaining a fire.

'3. A heat pr oducing and heat conserving apparatns comprsing a furnace in ommunication With akiln, stokers for supplying fu e1 1:0 said furnace, grat bars for support- 7 ing fuel in said furnace, and means for pre Oopis of this patent may be obtained for five cents eaeh, by addressihg the .heatproducing furnace,

heatng air to be fed to said furnace conssting of a combined ash and heated q3rehoating air and feeding the sarne to said cFurnace cons1stmg of a chute -dependmg fro1n said grate bars for receivi'ng' ashes from said grate bars and a fins-box at the termination of and communicating wth said chute, and means for maintaining a fire in Said fire-box for heating air and forcing the same up saidchute into said furnace.

A heat 'rodl.lcing and heat consering appaiatns com'prising a heatproducing furnace in communication with a kiln or curing furnace, means for supporting fuel for comnstion in -aid furnace, stokers for feeding fuel thoreto, means for exclnding unheated air from, said furnace, an inclined chute depending from said furnace, a valve for n= tercepting the passage through said chute, and a heat-producing member at the termination of and communicating with said chute.

6. A heat producing and heat conserving apparatus cdmprising a heat producing furnace in communication with a kiln.or curing furnace, grate bars supporting fuel in said stokers for feeding fuel thereto, chute depending froni said grate bars for removing ashes therefrom, a heat-producing mem ber at the terminaton of said chute and communicating therewith for heating air and forcing the same throngh said chute and through embers falling fror n said grate bars, and means for exclnding 001d air from said furnace. In testimony whereof, I 18th day of August', 1916.

V DAVID R. BONE.

Cbmmissioner o! 1atents,

set my hand, t his Washington, D. G.

a combin ed .ash and heated air 

